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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2012 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: StreamWriterAction.html 883 2014-05-07 02:45:34Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.dellroad.stuff.xml;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.Arrays;<a name="line.10"></a>
<span class="sourceLineNo">011</span><a name="line.11"></a>
<span class="sourceLineNo">012</span>import javax.xml.namespace.NamespaceContext;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import javax.xml.stream.XMLStreamConstants;<a name="line.13"></a>
<span class="sourceLineNo">014</span>import javax.xml.stream.XMLStreamException;<a name="line.14"></a>
<span class="sourceLineNo">015</span>import javax.xml.stream.XMLStreamReader;<a name="line.15"></a>
<span class="sourceLineNo">016</span>import javax.xml.stream.XMLStreamWriter;<a name="line.16"></a>
<span class="sourceLineNo">017</span><a name="line.17"></a>
<span class="sourceLineNo">018</span>import org.dellroad.stuff.string.StringEncoder;<a name="line.18"></a>
<span class="sourceLineNo">019</span><a name="line.19"></a>
<span class="sourceLineNo">020</span>/**<a name="line.20"></a>
<span class="sourceLineNo">021</span> * Represents some XML output event(s) that can be applied to an {@link XMLStreamWriter}.<a name="line.21"></a>
<span class="sourceLineNo">022</span> */<a name="line.22"></a>
<span class="sourceLineNo">023</span>public abstract class StreamWriterAction {<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    protected StreamWriterAction() {<a name="line.25"></a>
<span class="sourceLineNo">026</span>    }<a name="line.26"></a>
<span class="sourceLineNo">027</span><a name="line.27"></a>
<span class="sourceLineNo">028</span>    /**<a name="line.28"></a>
<span class="sourceLineNo">029</span>     * Apply this action to the given {@link XMLStreamWriter} by invoking method(s) to effect some XML output event(s).<a name="line.29"></a>
<span class="sourceLineNo">030</span>     *<a name="line.30"></a>
<span class="sourceLineNo">031</span>     * @param writer XML writer<a name="line.31"></a>
<span class="sourceLineNo">032</span>     * @throws NullPointerException if {@code writer} is null<a name="line.32"></a>
<span class="sourceLineNo">033</span>     */<a name="line.33"></a>
<span class="sourceLineNo">034</span>    public abstract void apply(XMLStreamWriter writer) throws XMLStreamException;<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>    /**<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * Get an instance that corresponds to the current event state of the given {@link XMLStreamReader}, such that<a name="line.37"></a>
<span class="sourceLineNo">038</span>     * a sequence of such instances created from consecutive input events will will recreate the input XML.<a name="line.38"></a>
<span class="sourceLineNo">039</span>     *<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * &lt;p&gt;<a name="line.40"></a>
<span class="sourceLineNo">041</span>     * This method does not advance or modify {@code reader}.<a name="line.41"></a>
<span class="sourceLineNo">042</span>     * &lt;/p&gt;<a name="line.42"></a>
<span class="sourceLineNo">043</span>     *<a name="line.43"></a>
<span class="sourceLineNo">044</span>     * @param reader XML input<a name="line.44"></a>
<span class="sourceLineNo">045</span>     * @throws XMLStreamException if an error occurs<a name="line.45"></a>
<span class="sourceLineNo">046</span>     * @throws NullPointerException if {@code reader} is null<a name="line.46"></a>
<span class="sourceLineNo">047</span>     */<a name="line.47"></a>
<span class="sourceLineNo">048</span>    public static StreamWriterAction of(XMLStreamReader reader) throws XMLStreamException {<a name="line.48"></a>
<span class="sourceLineNo">049</span>        switch (reader.getEventType()) {<a name="line.49"></a>
<span class="sourceLineNo">050</span>        case XMLStreamConstants.START_ELEMENT:<a name="line.50"></a>
<span class="sourceLineNo">051</span>            return new StartElementAction(reader);<a name="line.51"></a>
<span class="sourceLineNo">052</span>        case XMLStreamConstants.END_ELEMENT:<a name="line.52"></a>
<span class="sourceLineNo">053</span>            return new EndElementAction();<a name="line.53"></a>
<span class="sourceLineNo">054</span>        case XMLStreamConstants.PROCESSING_INSTRUCTION:<a name="line.54"></a>
<span class="sourceLineNo">055</span>            return new PIAction(reader);<a name="line.55"></a>
<span class="sourceLineNo">056</span>        case XMLStreamConstants.CHARACTERS:<a name="line.56"></a>
<span class="sourceLineNo">057</span>        case XMLStreamConstants.SPACE:<a name="line.57"></a>
<span class="sourceLineNo">058</span>            return new CharactersAction(reader);<a name="line.58"></a>
<span class="sourceLineNo">059</span>        case XMLStreamConstants.COMMENT:<a name="line.59"></a>
<span class="sourceLineNo">060</span>            return new CommentAction(reader);<a name="line.60"></a>
<span class="sourceLineNo">061</span>        case XMLStreamConstants.START_DOCUMENT:<a name="line.61"></a>
<span class="sourceLineNo">062</span>            return new StartDocumentAction(reader);<a name="line.62"></a>
<span class="sourceLineNo">063</span>        case XMLStreamConstants.END_DOCUMENT:<a name="line.63"></a>
<span class="sourceLineNo">064</span>            return new EndDocumentAction();<a name="line.64"></a>
<span class="sourceLineNo">065</span>        case XMLStreamConstants.ENTITY_REFERENCE:<a name="line.65"></a>
<span class="sourceLineNo">066</span>            return new EntityRefAction(reader);<a name="line.66"></a>
<span class="sourceLineNo">067</span>        case XMLStreamConstants.DTD:<a name="line.67"></a>
<span class="sourceLineNo">068</span>            return new DTDAction(reader);<a name="line.68"></a>
<span class="sourceLineNo">069</span>        case XMLStreamConstants.CDATA:<a name="line.69"></a>
<span class="sourceLineNo">070</span>            return new CDataAction(reader);<a name="line.70"></a>
<span class="sourceLineNo">071</span>        case XMLStreamConstants.ATTRIBUTE:<a name="line.71"></a>
<span class="sourceLineNo">072</span>        case XMLStreamConstants.NAMESPACE:<a name="line.72"></a>
<span class="sourceLineNo">073</span>            return new EmptyAction();<a name="line.73"></a>
<span class="sourceLineNo">074</span>        case XMLStreamConstants.NOTATION_DECLARATION:<a name="line.74"></a>
<span class="sourceLineNo">075</span>        case XMLStreamConstants.ENTITY_DECLARATION:<a name="line.75"></a>
<span class="sourceLineNo">076</span>            return new EmptyAction();                       // ???<a name="line.76"></a>
<span class="sourceLineNo">077</span>        default:<a name="line.77"></a>
<span class="sourceLineNo">078</span>            throw new XMLStreamException("unknown event type " + reader.getEventType());<a name="line.78"></a>
<span class="sourceLineNo">079</span>        }<a name="line.79"></a>
<span class="sourceLineNo">080</span>    }<a name="line.80"></a>
<span class="sourceLineNo">081</span><a name="line.81"></a>
<span class="sourceLineNo">082</span>// StreamWriterActions<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span>    private static class StartElementAction extends StreamWriterAction {<a name="line.84"></a>
<span class="sourceLineNo">085</span><a name="line.85"></a>
<span class="sourceLineNo">086</span>        final String prefix;<a name="line.86"></a>
<span class="sourceLineNo">087</span>        final String localName;<a name="line.87"></a>
<span class="sourceLineNo">088</span>        final String namespaceURI;<a name="line.88"></a>
<span class="sourceLineNo">089</span>        final NamespaceContext namespaceContext;<a name="line.89"></a>
<span class="sourceLineNo">090</span>        final String[] nsPrefix;<a name="line.90"></a>
<span class="sourceLineNo">091</span>        final String[] nsURI;<a name="line.91"></a>
<span class="sourceLineNo">092</span>        final String[] attrPrefix;<a name="line.92"></a>
<span class="sourceLineNo">093</span>        final String[] attrNamespace;<a name="line.93"></a>
<span class="sourceLineNo">094</span>        final String[] attrLocalName;<a name="line.94"></a>
<span class="sourceLineNo">095</span>        final String[] attrValue;<a name="line.95"></a>
<span class="sourceLineNo">096</span><a name="line.96"></a>
<span class="sourceLineNo">097</span>        public StartElementAction(XMLStreamReader reader) {<a name="line.97"></a>
<span class="sourceLineNo">098</span>            this.prefix = reader.getPrefix();<a name="line.98"></a>
<span class="sourceLineNo">099</span>            this.localName = reader.getLocalName();<a name="line.99"></a>
<span class="sourceLineNo">100</span>            this.namespaceURI = reader.getNamespaceURI();<a name="line.100"></a>
<span class="sourceLineNo">101</span>            this.namespaceContext = reader.getNamespaceContext();<a name="line.101"></a>
<span class="sourceLineNo">102</span>            final int numNS = reader.getNamespaceCount();<a name="line.102"></a>
<span class="sourceLineNo">103</span>            this.nsPrefix = new String[numNS];<a name="line.103"></a>
<span class="sourceLineNo">104</span>            this.nsURI = new String[numNS];<a name="line.104"></a>
<span class="sourceLineNo">105</span>            for (int i = 0; i &lt; numNS; i++) {<a name="line.105"></a>
<span class="sourceLineNo">106</span>                this.nsPrefix[i] = reader.getNamespacePrefix(i);<a name="line.106"></a>
<span class="sourceLineNo">107</span>                this.nsURI[i] = reader.getNamespaceURI(i);<a name="line.107"></a>
<span class="sourceLineNo">108</span>            }<a name="line.108"></a>
<span class="sourceLineNo">109</span>            final int numAttrs = reader.getAttributeCount();<a name="line.109"></a>
<span class="sourceLineNo">110</span>            this.attrPrefix = new String[numAttrs];<a name="line.110"></a>
<span class="sourceLineNo">111</span>            this.attrNamespace = new String[numAttrs];<a name="line.111"></a>
<span class="sourceLineNo">112</span>            this.attrLocalName = new String[numAttrs];<a name="line.112"></a>
<span class="sourceLineNo">113</span>            this.attrValue = new String[numAttrs];<a name="line.113"></a>
<span class="sourceLineNo">114</span>            for (int i = 0; i &lt; numAttrs; i++) {<a name="line.114"></a>
<span class="sourceLineNo">115</span>                this.attrPrefix[i] = reader.getAttributePrefix(i);<a name="line.115"></a>
<span class="sourceLineNo">116</span>                this.attrNamespace[i] = reader.getAttributeNamespace(i);<a name="line.116"></a>
<span class="sourceLineNo">117</span>                this.attrLocalName[i] = reader.getAttributeLocalName(i);<a name="line.117"></a>
<span class="sourceLineNo">118</span>                this.attrValue[i] = reader.getAttributeValue(i);<a name="line.118"></a>
<span class="sourceLineNo">119</span>            }<a name="line.119"></a>
<span class="sourceLineNo">120</span>        }<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span>        @Override<a name="line.122"></a>
<span class="sourceLineNo">123</span>        public void apply(XMLStreamWriter writer) throws XMLStreamException {<a name="line.123"></a>
<span class="sourceLineNo">124</span>            if (this.namespaceURI != null)<a name="line.124"></a>
<span class="sourceLineNo">125</span>                writer.writeStartElement(this.prefix, this.localName, this.namespaceURI);<a name="line.125"></a>
<span class="sourceLineNo">126</span>            else<a name="line.126"></a>
<span class="sourceLineNo">127</span>                writer.writeStartElement(this.localName);<a name="line.127"></a>
<span class="sourceLineNo">128</span>            writer.setNamespaceContext(namespaceContext);<a name="line.128"></a>
<span class="sourceLineNo">129</span>            for (int i = 0; i &lt; this.nsPrefix.length; i++)<a name="line.129"></a>
<span class="sourceLineNo">130</span>                writer.writeNamespace(this.nsPrefix[i], this.nsURI[i]);<a name="line.130"></a>
<span class="sourceLineNo">131</span>            for (int i = 0; i &lt; this.attrPrefix.length; i++) {<a name="line.131"></a>
<span class="sourceLineNo">132</span>                if (this.attrNamespace[i] != null)<a name="line.132"></a>
<span class="sourceLineNo">133</span>                    writer.writeAttribute(this.attrPrefix[i], this.attrNamespace[i], this.attrLocalName[i], this.attrValue[i]);<a name="line.133"></a>
<span class="sourceLineNo">134</span>                else<a name="line.134"></a>
<span class="sourceLineNo">135</span>                    writer.writeAttribute(this.attrLocalName[i], this.attrValue[i]);<a name="line.135"></a>
<span class="sourceLineNo">136</span>            }<a name="line.136"></a>
<span class="sourceLineNo">137</span>        }<a name="line.137"></a>
<span class="sourceLineNo">138</span><a name="line.138"></a>
<span class="sourceLineNo">139</span>        @Override<a name="line.139"></a>
<span class="sourceLineNo">140</span>        public String toString() {<a name="line.140"></a>
<span class="sourceLineNo">141</span>            final StringBuilder buf = new StringBuilder();<a name="line.141"></a>
<span class="sourceLineNo">142</span>            buf.append("StartElement[");<a name="line.142"></a>
<span class="sourceLineNo">143</span>            buf.append("prefix=\"").append(this.prefix).append("\"");<a name="line.143"></a>
<span class="sourceLineNo">144</span>            buf.append(",localName=\"").append(this.localName).append("\"");<a name="line.144"></a>
<span class="sourceLineNo">145</span>            buf.append(",namespaceURI=\"").append(this.namespaceURI).append("\"");<a name="line.145"></a>
<span class="sourceLineNo">146</span>            buf.append(",namespaceContext=\"").append(this.namespaceContext).append("\"");<a name="line.146"></a>
<span class="sourceLineNo">147</span>            buf.append(",attrPrefix=").append(Arrays.asList(this.attrPrefix));<a name="line.147"></a>
<span class="sourceLineNo">148</span>            buf.append(",attrNamespace=").append(Arrays.asList(this.attrNamespace));<a name="line.148"></a>
<span class="sourceLineNo">149</span>            buf.append(",attrLocalName=").append(Arrays.asList(this.attrLocalName));<a name="line.149"></a>
<span class="sourceLineNo">150</span>            buf.append(",attrValue=").append(Arrays.asList(this.attrValue));<a name="line.150"></a>
<span class="sourceLineNo">151</span>            buf.append("]");<a name="line.151"></a>
<span class="sourceLineNo">152</span>            return buf.toString();<a name="line.152"></a>
<span class="sourceLineNo">153</span>        }<a name="line.153"></a>
<span class="sourceLineNo">154</span>    }<a name="line.154"></a>
<span class="sourceLineNo">155</span><a name="line.155"></a>
<span class="sourceLineNo">156</span>    private static class EndElementAction extends StreamWriterAction {<a name="line.156"></a>
<span class="sourceLineNo">157</span><a name="line.157"></a>
<span class="sourceLineNo">158</span>        @Override<a name="line.158"></a>
<span class="sourceLineNo">159</span>        public void apply(XMLStreamWriter writer) throws XMLStreamException {<a name="line.159"></a>
<span class="sourceLineNo">160</span>            writer.writeEndElement();<a name="line.160"></a>
<span class="sourceLineNo">161</span>        }<a name="line.161"></a>
<span class="sourceLineNo">162</span><a name="line.162"></a>
<span class="sourceLineNo">163</span>        @Override<a name="line.163"></a>
<span class="sourceLineNo">164</span>        public String toString() {<a name="line.164"></a>
<span class="sourceLineNo">165</span>            return "EndElement";<a name="line.165"></a>
<span class="sourceLineNo">166</span>        }<a name="line.166"></a>
<span class="sourceLineNo">167</span>    }<a name="line.167"></a>
<span class="sourceLineNo">168</span><a name="line.168"></a>
<span class="sourceLineNo">169</span>    private static class PIAction extends StreamWriterAction {<a name="line.169"></a>
<span class="sourceLineNo">170</span><a name="line.170"></a>
<span class="sourceLineNo">171</span>        private final String target;<a name="line.171"></a>
<span class="sourceLineNo">172</span>        private final String data;<a name="line.172"></a>
<span class="sourceLineNo">173</span><a name="line.173"></a>
<span class="sourceLineNo">174</span>        public PIAction(XMLStreamReader reader) {<a name="line.174"></a>
<span class="sourceLineNo">175</span>            this.target = reader.getPITarget();<a name="line.175"></a>
<span class="sourceLineNo">176</span>            this.data = reader.getPIData();<a name="line.176"></a>
<span class="sourceLineNo">177</span>        }<a name="line.177"></a>
<span class="sourceLineNo">178</span><a name="line.178"></a>
<span class="sourceLineNo">179</span>        @Override<a name="line.179"></a>
<span class="sourceLineNo">180</span>        public void apply(XMLStreamWriter writer) throws XMLStreamException {<a name="line.180"></a>
<span class="sourceLineNo">181</span>            writer.writeProcessingInstruction(this.target, this.data);<a name="line.181"></a>
<span class="sourceLineNo">182</span>        }<a name="line.182"></a>
<span class="sourceLineNo">183</span><a name="line.183"></a>
<span class="sourceLineNo">184</span>        @Override<a name="line.184"></a>
<span class="sourceLineNo">185</span>        public String toString() {<a name="line.185"></a>
<span class="sourceLineNo">186</span>            return "PI[target=\"" + this.target + "\",data=\"" + this.data + "\"]";<a name="line.186"></a>
<span class="sourceLineNo">187</span>        }<a name="line.187"></a>
<span class="sourceLineNo">188</span>    }<a name="line.188"></a>
<span class="sourceLineNo">189</span><a name="line.189"></a>
<span class="sourceLineNo">190</span>    private static class CharactersAction extends StreamWriterAction {<a name="line.190"></a>
<span class="sourceLineNo">191</span><a name="line.191"></a>
<span class="sourceLineNo">192</span>        protected final String text;<a name="line.192"></a>
<span class="sourceLineNo">193</span><a name="line.193"></a>
<span class="sourceLineNo">194</span>        public CharactersAction(XMLStreamReader reader) {<a name="line.194"></a>
<span class="sourceLineNo">195</span>            this.text = reader.getText();<a name="line.195"></a>
<span class="sourceLineNo">196</span>        }<a name="line.196"></a>
<span class="sourceLineNo">197</span><a name="line.197"></a>
<span class="sourceLineNo">198</span>        public void apply(XMLStreamWriter writer) throws XMLStreamException {<a name="line.198"></a>
<span class="sourceLineNo">199</span>            writer.writeCharacters(this.text);<a name="line.199"></a>
<span class="sourceLineNo">200</span>        }<a name="line.200"></a>
<span class="sourceLineNo">201</span><a name="line.201"></a>
<span class="sourceLineNo">202</span>        @Override<a name="line.202"></a>
<span class="sourceLineNo">203</span>        public String toString() {<a name="line.203"></a>
<span class="sourceLineNo">204</span>            return this.getClass().getSimpleName().replaceAll("Action$", "") + "[text="<a name="line.204"></a>
<span class="sourceLineNo">205</span>              + StringEncoder.enquote(this.text) + "]";<a name="line.205"></a>
<span class="sourceLineNo">206</span>        }<a name="line.206"></a>
<span class="sourceLineNo">207</span>    }<a name="line.207"></a>
<span class="sourceLineNo">208</span><a name="line.208"></a>
<span class="sourceLineNo">209</span>    private static class CommentAction extends CharactersAction {<a name="line.209"></a>
<span class="sourceLineNo">210</span><a name="line.210"></a>
<span class="sourceLineNo">211</span>        public CommentAction(XMLStreamReader reader) {<a name="line.211"></a>
<span class="sourceLineNo">212</span>            super(reader);<a name="line.212"></a>
<span class="sourceLineNo">213</span>        }<a name="line.213"></a>
<span class="sourceLineNo">214</span><a name="line.214"></a>
<span class="sourceLineNo">215</span>        @Override<a name="line.215"></a>
<span class="sourceLineNo">216</span>        public void apply(XMLStreamWriter writer) throws XMLStreamException {<a name="line.216"></a>
<span class="sourceLineNo">217</span>            writer.writeComment(this.text);<a name="line.217"></a>
<span class="sourceLineNo">218</span>        }<a name="line.218"></a>
<span class="sourceLineNo">219</span>    }<a name="line.219"></a>
<span class="sourceLineNo">220</span><a name="line.220"></a>
<span class="sourceLineNo">221</span>    private static class DTDAction extends CharactersAction {<a name="line.221"></a>
<span class="sourceLineNo">222</span><a name="line.222"></a>
<span class="sourceLineNo">223</span>        public DTDAction(XMLStreamReader reader) {<a name="line.223"></a>
<span class="sourceLineNo">224</span>            super(reader);<a name="line.224"></a>
<span class="sourceLineNo">225</span>        }<a name="line.225"></a>
<span class="sourceLineNo">226</span><a name="line.226"></a>
<span class="sourceLineNo">227</span>        @Override<a name="line.227"></a>
<span class="sourceLineNo">228</span>        public void apply(XMLStreamWriter writer) throws XMLStreamException {<a name="line.228"></a>
<span class="sourceLineNo">229</span>            writer.writeDTD(this.text);<a name="line.229"></a>
<span class="sourceLineNo">230</span>        }<a name="line.230"></a>
<span class="sourceLineNo">231</span>    }<a name="line.231"></a>
<span class="sourceLineNo">232</span><a name="line.232"></a>
<span class="sourceLineNo">233</span>    private static class CDataAction extends CharactersAction {<a name="line.233"></a>
<span class="sourceLineNo">234</span><a name="line.234"></a>
<span class="sourceLineNo">235</span>        public CDataAction(XMLStreamReader reader) {<a name="line.235"></a>
<span class="sourceLineNo">236</span>            super(reader);<a name="line.236"></a>
<span class="sourceLineNo">237</span>        }<a name="line.237"></a>
<span class="sourceLineNo">238</span><a name="line.238"></a>
<span class="sourceLineNo">239</span>        @Override<a name="line.239"></a>
<span class="sourceLineNo">240</span>        public void apply(XMLStreamWriter writer) throws XMLStreamException {<a name="line.240"></a>
<span class="sourceLineNo">241</span>            writer.writeCData(this.text);<a name="line.241"></a>
<span class="sourceLineNo">242</span>        }<a name="line.242"></a>
<span class="sourceLineNo">243</span>    }<a name="line.243"></a>
<span class="sourceLineNo">244</span><a name="line.244"></a>
<span class="sourceLineNo">245</span>    private static class StartDocumentAction extends StreamWriterAction {<a name="line.245"></a>
<span class="sourceLineNo">246</span><a name="line.246"></a>
<span class="sourceLineNo">247</span>        protected final String encoding;<a name="line.247"></a>
<span class="sourceLineNo">248</span>        protected final String version;<a name="line.248"></a>
<span class="sourceLineNo">249</span><a name="line.249"></a>
<span class="sourceLineNo">250</span>        public StartDocumentAction(XMLStreamReader reader) {<a name="line.250"></a>
<span class="sourceLineNo">251</span>            this.encoding = reader.getEncoding();<a name="line.251"></a>
<span class="sourceLineNo">252</span>            this.version = reader.getVersion();<a name="line.252"></a>
<span class="sourceLineNo">253</span>        }<a name="line.253"></a>
<span class="sourceLineNo">254</span><a name="line.254"></a>
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</pre>
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